Ibstone windmill, a smock mill, last worked during the First World War.
However it gained a new lease of life in 1967 when it was fitted with mock
sails and fantail in preparation for its appearance in the feature film
Chitty Chitty Bang Bang, as the workshop of the inventor,
Caractacus Potts. (And based on visual evidence from the film, the sails
were remarkably efficient, managing to keep the mill turning at all times
of the day or night, despite the absence of sailcloth, and scarcely
needing any wind at all to turn!)

Caractacus Potts, with Chitty Chitty Bang Bang in his yard., From The Adventures of Chitty Chitty Bang Bang - A Special Motion-Picture
Edition by Albert G Miller, published by Collins in 1968.

Truly Scruptious taking Jeremy and Jemima home., From The Adventures of Chitty Chitty Bang Bang - A Special Motion-Picture
Edition by Albert G Miller, published by Collins in 1968.

Truly Scruptious inspects the windmill.
(Note that this image has been printed reversed left to right!
- the sails are the other way round compared to the other pictures).
, From The Adventures of Chitty Chitty Bang Bang - A Special Motion-Picture
Edition by Albert G Miller, published by Collins in 1968.